Does it have to be reflective or merely non-transparent?
A layer of soot from a candle flame would be easy to apply,
and non-transparent, but not very reflective.
You can deposit a thin layer of silver from solution
with Tollen's reagent. This is much simpler and
cheaper than sputtering, unless you already have
a sputtering apparatus.
http://www.chymist.com/silver%20flask.pdf

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